Regular Expressions 101

Explanation

Pro

^start of line

Negative Lookahead(?!.*not)

.*any character (except for line terminators), repeated any number of times

notthe literal text not (case sensitive)

.+any character (except for line terminators), repeated at least once

Positive Lookahead(?=good)

goodthe literal text good (case sensitive)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

^(?!.*not).+(?=good)

New

text is good
text is not good

not text is good
text is good not

text is good
text is not good

not text is good
text is good not